The interface can be a little confusing to navigate at first, but we're here to help! If you want to tag a video that you recently classified, you can go to your profile and look for the thumbnail of the video -- you may need to scroll down. Then mouse over it and click on the speech bubble icon. From there you can fill in the blue box with comments or tags.
We'd be happy to try to help you ID the species in the video -- someone will respond if you comment on the video or link to it in a discussion. : )